Recherche avancée

Sur d’autres sites (6125)

• avfilter/bufferqueue : Increase buffer queue size

  3 juin 2014, par Tobias Rapp

  avfilter/bufferqueue : Increase buffer queue size
  Avoid buffer overruns when processing some MOV files with the amerge
  
  filter. Files produced by Adobe Premiere Pro CC have up to one second of audio
  
  not interleaved. With common settings (<= 48kHz) that makes up to 47 frames so
  
  a queue length of 64 makes sense.
  Fixes ticket #3510.
  Reviewed-by : Nicolas George <george@nsup.org>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavfilter/bufferqueue.h

• How to convert MP4 frame rate like 14.939948fps to 15fps

  16 juillet 2023, par Bling Bling Bytes

  Description

  


  I pushed a USB camera stream by ffmpeg to a RTMP stream server which is called SRS.

  


  The SRS had saved a MP4 file for me. The frame rate is not a common value in VLC - it's 14.939948. I've checked it out - It seems to be the 'ntsc' format.

  


  Meanwhile, I had received the stream by OpenCV and saved it as another MP4 file.They're not synchronized.

  


  I have tried to convert the frame rate by ffmpeg but was still not synchronized. The only way to make it is to put it in Adobe Premiere and modify the frame rate. Here is the ffmpeg commands I executed :

  


  ffmpeg -i 1639444871684_copy.mp4 -filter:v fps=15 out.mp4


  


  Aside from the stream server, how can I convert the frame rate to normal and keep synchronized at the same time ?

  


• Using Qt Media Player on Raspberry Pi 1

  18 mai 2015, par Mauker

  I have a project built using Qt5 which has to play a video. Just like in the videowidget sample code.

  I’ve followed these instructions to build qt5 on my Pi. And it went just fine. But when I try to run any qt program that uses QMediaPlayer, I get the error message :

  defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"

  Which means I don’t have a backend to play the video, right ? Is there any one that I can use which will with Qt, like ffmpeg ? And how can I get it to work ? Specially for h264 videos.

  I’ve tried to install gstreamer as is told on this link, but it’s not working. Will I have to rebuild the entire qt5 again ?

  P.S. : I have the raspberry pi 1 model B with raspbian installed.

  Edit : As mentioned by Greenflow, I checked the ./configure log and saw that the GStreamer was compiled in, but the video apps are still not working...

  The message on the log was like this :

  GStreamer .............. yes (0.10)

  And the message on Greenflow’s log was like this :

  GStreamer .............. yes (1.0)

  Clearly it’s another version of GStreamer, but is it the problem ?

  I’ve also found this post which says QtMultimedia on the Pi is rather useless, but the post is from 2013, so I’m not sure if it’s really relevant. I’d like to have this app playing hardware accelerated videos on my Raspberry Pi, but I’m almost dropping the idea.

  Anyways, thanks Greenflow for the head start.

  Edit 2 : Found this thread on the Qtcentre. Damn, this thing is not going to be easy to solve, I guess...